Follow-up Comment #6, bug #23414 (project freeciv):
If AC_CHECK_HEADERS is placed under AC_CHECK_CACHED "configure" will produce
inconsistent output like this: "checking for nullptr... checking for
cstdlib... ok".
I think it would be better to utilise AC_CHECK_HEADER_ONCE to make header
check cached but that macros ignores AC_LANG_PUSH([C++]).
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